Suppress maybe-uninitialized warning.HEADmaster

Following commit e035863c9a0, building with -O0 began triggering
warnings about potentially uninitialized 'workbuf' usage. While
theoretically the initialization isn't necessary since VARDATA()
doesn't access the contents of the pointed-to object, this commit
explicitly initializes the workbuf variable to suppress the warning.

Buildfarm members adder and flaviventris have shown the warning.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAD21AoCOZxfqnNgfM5yVKJZYnOq5m2Q96fBGy1fovEqQ9V4OZA@mail.gmail.com

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